Just because it's spoken by more native speakers than any other language that doesn't automatically make Mandarin more relevant in a global context.

English is a global language due to its history (largely grounded in the British Empire's colonial history). Mandarin on the other hand in a global context as of today is still largely irrelevant because it's only spoken in one country, even as that country is as globally relevant as China.

That might change in the future but unless you specifically deal with China and Chinese businesses Mandarin is no more relevant on a global level than - say - Russian or German.